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Using a continuous-wave, single-frequency, tunable dye laser, the authors have made accurate absorption measurements of the band oscillator strength for various rotational-electronic lines in the ²Σ⁺(v^'=0)←²Π(v^''=0) transitions of OH. The band oscillator strength is seen to decrease linearly with the energy of rotational excitation. It is established that this decrease results solely from lengthening of the internuclear distance due to rotation.
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Wang et al. (1979) studied this question.
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